Chief Constable of the North Wales Police v Evans [1982] UKHL 10 is a UK constitutional law case, concerning judicial review.
The Chief Constable interviewed him and asked him to resign rather than formally firing him on the grounds that Evans (1) married a woman much older than himself, the former mistress of his uncle, which ostensibly might have been a scandal for the force, (2) he was keeping four dogs in a police council house, which had a one dog limit, and (3) Evans and his wife lived a “hippy” lifestyle.
However, an order for mandamus for reinstatement would usurp the Chief Constable’s powers, so declaring the action void was unsatisfactory.
In my opinion the law was correctly stated in the speech of Lord Evershed (at page 96).
Lord Evershed referred to "a danger of usurpation of power on the part of the courts... under the pretext of having regard to the principles of natural justice."